🧪 Part 2: Minimal Stratum V2 Handshake (Noise XX/NX + SetupConnection) Following up on the Noise Protocol intro — here's a small, self-contained C implementation that performs a Noise handshake (XX or NX) and exchanges Stratum V2 SetupConnection messages immediately after. It’s built to test client/server handshake logic without needing full SV2 support or encryption on the transport layer (yet). Just Noise + SetupConnection, using raw TCP with framed messages. 🔧 What’s included: Minimal “pool server” (sv2_pool_server.c) that: Accepts TCP connections Completes a Noise handshake (XX by default, NX optional via --nx) Decodes a SetupConnection message and responds with SetupConnection.Success Matching client (noise_client.c) that: Connects to the pool Runs Noise handshake Sends a valid SetupConnection payload Handshake and transport logic is handled using noise-c — clean, constant-time, and easy to audit. 🔐 Handshake Patterns: XX: Both parties are anonymous; ephemeral key exchange on both sides. NX: Server has a static key; client is ephemeral (more realistic for mining pools). These map directly to Noise patterns (Noise_XX_25519_ChaChaPoly_BLAKE2s) and can be swapped via --xx / --nx. 🧰 Framing and Messages: Transport uses simple framing: uint16_be length prefix + payload. After handshake, we send: SetupConnection (client → server) SetupConnection.Success (server → client) These are built using SV2 helpers (sv2_common.[ch], sv2_wire.[ch]) to encode/decode the frames. 🔄 Example Usage: Start the pool server: ./sv2_pool_server -l 0.0.0.0:3334 --prologue STRATUM/2 --sk <hex-secret> Start the client: ./noise_client -l 127.0.0.1:3334 --prologue STRATUM/2 Both ends should print confirmation of the handshake and the SetupConnection exchange. 🚫 What's intentionally missing (for now): No full SV2 session yet (no channel open, no job distribution) No post-handshake encryption of transport messages No persistent session keys or reconnection logic This is by design — the goal is to test handshakes + basic SV2 flows before introducing more complexity. Once the handshake layer is stable, you can drop in encrypted transport using sv2_noise_send_transport() and sv2_noise_recv_transport() provided in the demo. 💡 I’m using this for testing SV2 client implementations and validating message formats over raw TCP before wiring into a full miner or pool stack. This is all part of adding SV2 mining protocol support to Datum gateway. I already have a SV1 to SV2 translator. Now adding SV2 server features. #noiseprotocol #stratumv2 #miningprotocol #bitcoinmining #handshake #cryptography #protocoltesting #cprogramming #securecommunications #nostrdev #decentralization #packetengineering #DLT View quoted note →